<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="/js/vue.js"></script>
    <title>Document</title>
</head>
<body>
    <div id ="app">
        <div v-bind:style="{color:activeColor,fontSize:fontSize+'px'}">Hello World!</div>"
        <div v-bind:style="styleObj">Vue.js</div>
    </div>
</body>
<script>
    var vm = new Vue({
        el:'#app',
        data:{
            activeColor:'red',
            fontSize:30,
            styleSize:30,
            styleObj:{
                fontSize:'30px',
                'text-decoration':'underline'
            }
        }
    })
</script>